Triggering a Pop-up made WP Popups on a button click

I have started using SiteOrigin recently, which is very convenient to design a page from the base and have been enjoying working on it but I am stuck with only one problem which is triggering a popup on click of a button, let’s say I have multiple buttons on a single page and each button needs to popup and gather information and create lead accordingly to it’s dedicated package.

Now, I had tried every possible way to trigger but I am not able to run a simple class=”spu-open-412″, I was wondering if someone could help since I have read all related topics of SiteOrigin & WP-Popups which does not address or gives a solution to this issue.

PS: I am not a hardcore programmer, just a designer but I’ve got this project by luck and afraid that I wouldn’t be able to present the mockup in time.

Thanks in advance.
Mock website link: https://tinyurl.com/ms7pf5eu